Yahya related to me from Malik from Hisham ibn Urwa from his father that A'isha, umm al-muminin said, "The Messenger of Allah ﷺ used to pray thirteen rakas in the night and then would pray two rakas when he heard the adhan for the subh prayer."
قَالَتْ كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي بِاللَّيْلِ ثَلاَثَ عَشْرَةَ رَكْعَةً ثُمَّ يُصَلِّي إِذَا سَمِعَ النِّدَاءَ بِالصُّبْحِ رَكْعَتَيْنِ خَفِيفَتَيْنِ